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    <title>Document</title>
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  <style>
    /* @import url('https://fonts.googleapis.com/css?family=Varela+Round'); */
    * {
      box-sizing: border-box;
    }
    :root {
      --accent-color: #45494e;
      --gradient-color: #fbfbfb;
    }
    a:focus {
      outline: none;
      position: relative;
    }
    a:focus:after {
      width: 50px;
    }
    a:after {
      content: '';
      background: #fbfbfb;
      position: absolute;
      bottom: 5px;
      left: 15px;
      height: 3px;
      width: 0;
      transition: 0.5s;
      transition-delay: 0.2s;
    }
    body {
      background: #45494e;
      font-family: 'Varela Round', Nunito, Montserrat, sans-serif;
      margin: 0;
      padding: 0;
    }
    .menu {
      margin: 15px;
    }
    .menu > ol {
      list-style: none;
      margin: 30px 0;
      padding: 0;
    }
    .menu > ol > li {
      background: #3c3c3c;
      border-left: 5px solid var(--gradient-color);
      margin-bottom: 1px;
      position: relative;
      transition: 0.5s;
    }
    .menu > ol > li:nth-child(1) {
      --accent-color: #fda085;
      --gradient-color: #f6d365;
    }
    .menu > ol > li:nth-child(2) {
      --accent-color: #bff098;
      --gradient-color: #6fd6ff;
    }
    .menu > ol > li:nth-child(3) {
      --accent-color: #ea8d8d;
      --gradient-color: #a890fe;
    }
    .menu > ol > li:nth-child(4) {
      --accent-color: #d8b5ff;
      --gradient-color: #1eae98;
    }
    .menu > ol > li:nth-child(5) {
      --accent-color: #c6ea8d;
      --gradient-color: #fe90af;
    }
    .menu > ol > li a {
      color: #fbfbfb;
      display: block;
      padding: 15px;
      position: relative;
      text-decoration: none;
      z-index: 1;
    }
    .menu > ol > li a:not(:last-child):before {
      content: '\f078';
      font-family: fontAwesome;
      font-size: 0.75em;
      line-height: 50px;
      position: absolute;
      right: 25px;
      top: 0;
      bottom: 0;
      margin: auto;
      transition: 0.5s;
    }
    .menu > ol > li:focus,
    .menu > ol > li:focus-within,
    .menu > ol > li:hover {
      z-index: 100;
    }
    .menu > ol > li:focus:after,
    .menu > ol > li:focus-within:after,
    .menu > ol > li:hover:after {
      background: linear-gradient(
        to left,
        var(--accent-color),
        var(--gradient-color)
      );
      max-width: 800px;
    }
    .menu > ol > li:focus .sub-menu,
    .menu > ol > li:focus-within .sub-menu {
      max-height: 500px;
    }
    .menu > ol > li:focus a:before,
    .menu > ol > li:focus-within a:before {
      transform: rotate(-180deg);
    }
    .menu > ol > li:after {
      background: #3c3c3c;
      content: '';
      position: absolute;
      left: 0;
      right: 0;
      top: 0;
      bottom: 0;
      transition: 0.5s;
      max-width: 0;
      overflow: hidden;
    }
    .menu > ol .sub-menu {
      border-left: 1px solid #fbfbfb;
      margin-left: 22.5px;
      list-style: none;
      max-height: 0px;
      overflow: hidden;
      padding-left: 7.5px;
      position: relative;
      transition: 0.5s;
      z-index: 1;
    }
    .menu > ol .sub-menu li {
      font-size: 0.9em;
    }
    .menu > ol .sub-menu li:hover,
    .menu > ol .sub-menu li a:focus {
      background: rgba(60, 60, 60, 0.3);
    }
    .menu > ol .sub-menu li a:after {
      bottom: 5px;
      height: 1px;
    }
    .menu > ol .sub-menu li a:hover:after,
    .menu > ol .sub-menu li a:focus:after {
      width: 15px;
    }
    @media (min-width: 775px) {
      a:focus,
      a:hover {
        position: relative;
      }
      a:focus:after,
      a:hover:after {
        width: 50px;
      }
      a:after {
        left: 0;
        right: 0;
        margin: auto;
      }
      .menu {
        margin: 0;
        margin-top: 40vh;
      }
      .menu > ol {
        display: block;
        max-width: none;
        text-align: center;
      }
      .menu > ol > li {
        border-top: 5px solid var(--accent-color);
        border-left: 0;
        display: inline-block;
        margin-left: -5px;
        vertical-align: top;
        width: 150px;
      }
      .menu > ol > li:hover:after,
      .menu > ol > li:focus:after,
      .menu > ol > li:focus-within:after {
        background: linear-gradient(
          to bottom,
          var(--accent-color),
          var(--gradient-color)
        );
        border-radius: 3px;
        top: -15px;
        bottom: -15px;
        left: -15px;
        right: -15px;
      }
      .menu > ol > li:hover .sub-menu,
      .menu > ol > li:focus .sub-menu,
      .menu > ol > li:focus-within .sub-menu {
        max-height: 750px;
      }
      .menu > ol > li:hover a:before {
        transform: rotate(-180deg);
      }
      .menu > ol .sub-menu {
        border-left: 0;
        margin: 15px -15px -15px;
        padding-left: 0;
      }
    }
  </style>
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